Is tap water in Tucson, AZ safe to drink?

Tucson tap water is monitored by City of Tucson under EPA regulations. This report shows current contaminant levels compared to EPA legal limits and EWG health guidelines.

What contaminants are in Tucson tap water?

WaterHealthCheck tests Tucson water for 31 contaminants including PFAS compounds, lead, fluoride, chloramine, nitrate, arsenic, chromium-6, haloacetic acids, and more using EPA SDWIS and UCMR5 data.

Does Tucson water have PFAS?

PFAS levels in Tucson water are sourced from EPA UCMR5 monitoring (2023–2025). See the contaminant table above for specific detected compounds and concentrations.

What utility serves Tucson tap water?

Tucson, AZ tap water is served by City of Tucson (PWSID: AZ0410112).

How does Tucson tap water compare to EPA limits?

1 contaminant in Tucson water exceed EPA legal limits. 1 exceed the stricter EWG health guideline.

Water Health Check Report

Tucson, AZ

Name: US Tap Water Quality by ZIP Code
Creator: WaterHealthCheck
License: https://creativecommons.org/licenses/by/4.0/

City of Tucson · Groundwater source

Fair

1 above EPA limit
1 above EWG guideline

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EPA · AZ0410112UCMR5 PFAS data included732,906 people servedLast updated Jan 2026

EPA SDWIS · January 2026EPA UCMR5 · October 2025

Fair — with 2 concerns

City of Tucson has 1 contaminant above EPA legal limits and 1 above EWG health guidelines. Lead levels within limits at treatment plant

Lead levels within limits at treatment plant

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Contaminants tested

31 total · 1 above EWG guideline

Contaminant	Category	Level	Status
Turbidity	microbial	ND NTU	Above EPA limit
PFBA (perfluorobutanoic acid) CAS 375-22-4	pfas	8.1 ppt	Above guideline
Total trihalomethanes (TTHMs) CAS Various	disinfection byproduct	ND ppb	Within limits
Lithium CAS 7439-93-2	mineral	21.4 ppb	Within limits
Fluoride CAS 16984-48-8	mineral	ND ppm	Within limits
Chlorine (residual) CAS 7782-50-5	disinfectant	ND ppm	Within limits
Copper CAS 7440-50-8	heavy metal	ND ppm	Within limits
9Cl-PF3ONS (9-chlorohexadecafluoro-3-oxanone-1-sulfonic acid) CAS 756426-58-1	pfas	ND	Not detected
ADONA (4,8-dioxa-3H-perfluorononanoic acid) CAS 919005-14-4	pfas	ND	Not detected
PFBS (perfluorobutane sulfonic acid) CAS 375-73-5	pfas	ND	Not detected
PFTrDA (perfluorotridecanoic acid) CAS 72629-94-8	pfas	ND	Not detected
PFPeA (perfluoropentanoic acid) CAS 2706-90-3	pfas	ND	Not detected
PFPeS (perfluoropentane sulfonic acid) CAS 2706-91-4	pfas	ND	Not detected
6:2 FTS (6:2 fluorotelomer sulfonic acid) CAS 27619-97-2	pfas	ND	Not detected
4:2 FTS (4:2 fluorotelomer sulfonic acid) CAS 757124-72-4	pfas	ND	Not detected
8:2 FTS (8:2 fluorotelomer sulfonic acid) CAS 39108-34-4	pfas	ND	Not detected
PFHpS (perfluoroheptane sulfonic acid) CAS 375-92-8	pfas	ND	Not detected
PFTA (perfluorotetradecanoic acid) CAS 376-06-7	pfas	ND	Not detected
NEtFOSAA (N-ethyl perfluorooctane sulfonamido acetic acid) CAS 2991-50-6	pfas	ND	Not detected
HFPO-DA / GenX (hexafluoropropylene oxide dimer acid) CAS 13252-13-6	pfas	ND	Not detected
NMeFOSAA (N-methyl perfluorooctane sulfonamido acetic acid) CAS 2355-31-9	pfas	ND	Not detected
PFUnA (perfluoroundecanoic acid) CAS 2058-94-8	pfas	ND	Not detected
PFHpA (perfluoroheptanoic acid) CAS 375-85-9	pfas	ND	Not detected
PFHxS (perfluorohexane sulfonic acid) CAS 355-46-4	pfas	ND	Not detected
PFNA (perfluorononanoic acid) CAS 375-95-1	pfas	ND	Not detected
PFOS (perfluorooctane sulfonate) CAS 1763-23-1	pfas	ND	Not detected
PFOA (perfluorooctanoic acid) CAS 335-67-1	pfas	ND	Not detected
PFDA (perfluorodecanoic acid) CAS 335-76-2	pfas	ND	Not detected
PFDoA (perfluorododecanoic acid) CAS 307-55-1	pfas	ND	Not detected
11Cl-PF3OUdS (11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid) CAS 763051-92-9	pfas	ND	Not detected
PFHxA (perfluorohexanoic acid) CAS 307-24-4	pfas	ND	Not detected

LegendWithin limitsAbove EWG guidelineAbove EPA limitNot detectedSource: EPA SDWIS · UCMR5 · EWG Health Guidelines

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Data sources

EPA UCMR5 (PFAS + lithium)·October 2025·One-time programme 2023–2025

EPA SDWIS compliance data·January 2026·Annual reporting cycle

Status flags compare detected levels against both EPA legal limits and EWG health-based guidelines—which are stricter and science-derived, independent of political feasibility.

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